Method HasComponent

HasComponent<T>(Entity)

Checks whether an entity has a specific type of component.

Declaration

public static bool HasComponent<T>(Entity entity) where T : unmanaged, IComponentData

Parameters

Type	Name	Description
Entity	entity	The Entity object.

Returns

Type	Description
bool	True, if the specified entity has the component.

Type Parameters

Name	Description
T	The data type of the component.

Remarks

Always returns false for an entity that has been destroyed.

Use this method to check if another entity has a given type of component using its Entity object. For example, if you have a component that contains an Entity field, you can check whether the referenced entity has a specific type of component using this method. (Entities in the set always have required components, so you don’t need to check for them.)

When iterating over a set of entities via IJobEntity or Query<T1>(), avoid using this method with the current entity in the set. It is generally faster to change your entity query methods to avoid optional components; this may require a different construction to handle each combination of optional and non-optional components.

When you call this method this method gets replaced with component access methods through a cached ComponentLookup<T>.

This lookup method results in a slower, indirect memory access. When possible, organize your data to minimize the need for indirect lookups.

HasComponent<T>(SystemHandle)

Checks whether an entity associated with a system has a specific type of component.